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. 2021 Apr 28;11(5):1154.
doi: 10.3390/nano11051154.

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

Affiliations

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

Alexander Omelyanchik et al. Nanomaterials (Basel). .

Abstract

Polymer-based magnetoelectric composite materials have attracted a lot of attention due to their high potential in various types of applications as magnetic field sensors, energy harvesting, and biomedical devices. Current researches are focused on the increase in the efficiency of magnetoelectric transformation. In this work, a new strategy of arrangement of clusters of magnetic nanoparticles by an external magnetic field in PVDF and PFVD-TrFE matrixes is proposed to increase the voltage coefficient (αME) of the magnetoelectric effect. Another strategy is the use of 3-component composites through the inclusion of piezoelectric BaTiO3 particles. Developed strategies allow us to increase the αME value from ~5 mV/cm·Oe for the composite of randomly distributed CoFe2O4 nanoparticles in PVDF matrix to ~18.5 mV/cm·Oe for a composite of magnetic particles in PVDF-TrFE matrix with 5%wt of piezoelectric particles. The applicability of such materials as bioactive surface is demonstrated on neural crest stem cell cultures.

Keywords: PVDF; PVDF-TrFE; barium titanate; cobalt ferrite; magnetoelectric effect; multiferroics; nanoparticles.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Illustration of the alignment of CFO NPs in PVDF polymer in a magnetic field; (b) optical image of the formation of ordered chains of CFO NPs clusters in the liquid precursor of PVDF-TrFE polymer under external magnetic fields of different inductions. The sketch represents a structure of the chain as an elongated assembly of NPs clusters with the random distribution of easy axes of individual particles inside each cluster (red lines).
Figure 2
Figure 2
Scheme of the experiment for direct magnetoelectric (ME) measurements (1—sample, 2—Helmholtz coils, 3—DC magnetic field source, 4—aligned chains of particle clusters); the red arrow indicates the direction in which sample was rotated.
Figure 3
Figure 3
XRD patterns of CFO and BTO nanoparticles, CFO/PVDF, CFO/PVDF-TrFE, and CFO/BTO10/PVDF-TrFE nanocomposites. The Miller indexes specified for pure CFO, BTO particles and PVDF (PVDF-TrFE) polymer are guided to corresponding reflections in composites via dashed lines.
Figure 4
Figure 4
In-plane M-H loops reordered at 300 K for random and ordered (a) PVDF/CFO and (b) PVDF-TrFE/CFO nanocomposite compared with CFO NPs; M-H loops for ordered PVDF-TrFE/CFO sample as a function of sample axis and field direction in (c) in-plane and (d) from in-plane to out-of-plane orientations.
Figure 5
Figure 5
First order reversal curves (FORC) diagram for (a) CFO NPs and (b) PVDF-TrFE/CFO nanocomposite sample.
Figure 6
Figure 6
(a) Magnetic force microscopy (MFM) images of PVDF-TrFE/CFO nanocomposite: topology, MFM signals, and their difference. Arrow B indicates the direction of the applied magnetic field during polymerization. Scale bar is 2 μm; (b) TEM image of separated aggregates of powder CFO NPs; (c) illustration of a possible configuration of two aggregates and simulated magnetic field distribution for this configuration.
Figure 7
Figure 7
(a) Field and (b) angular dependencies of the ME voltage coefficient (αME) on DC bias magnetic field for ordered and random PVDF/CFO and PVDFTrFE/CFO composites at AC field frequency of 10 kHz.
Figure 8
Figure 8
Piezoresponse force microscopy (PFM) images (ad) and remnant local piezoelectric hysteresis loops (e,f) at applied (Bext. ON) and switched off (Bext. OFF) the magnetic field (Bext. = 1.4 kOe) for (a,b,e) PVDF/CFO and (c,d,f) PVDF-TrFE/CFO samples.
Figure 9
Figure 9
(a) Dependencies of the ME voltage coefficient (αME) on DC bias magnetic field composites at AC field frequency of 10 kHz for PVDF-TrFE -based samples with ZCFO, BTO5/CFO and BTO10/CFO fillers (PVDF-TrFE/CFO is shown again for comparison); (b) piezoresponse force microscopy (PFM) images and remnant local piezoelectric hysteresis loops at applied and switched off the magnetic field (Bext. = 1.4 kOe) for PVDF-TrFE/BTO5/CFO sample; (c) M-H loops at 300 K for PVDF-TrFE/ZCFO, PVDF-TrFE/BTO5/CFO and PVDF-TrFE/BTO10/CFO NCs.
Figure 10
Figure 10
Schematic diagram explaining the mechanism of arising of dipolar interactions leading to the displacement of aggregates of CFO NPs: in zero magnetic fields (explanation is in the text).
Figure 11
Figure 11
Images of neural crest stem cells (bNCSC), expressing red fluorescence signal (RFP) after 24 h, 48 h, 72 h of culture on PVDF substrate (×20); arrow indicates cells migrating from the neurosphere. Scale bar is 25 μm.
Figure 12
Figure 12
βIII-tubulin and GFAP (green) expression bNCSCs growing on PVDF substrate (×40). Blue–Hoechst nuclear stain; arrow indicates cells migrating from the neurosphere. Scale bar = 25 μm.

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